1樓:盈公子
(1)642-(36+132)÷4
=642-168÷4
=642-42
=600;
(2)375+125÷5×12
=375+25×12
=375+300
=675;
(3)868-(168+54)
=868-168-54
=700-54
=646;
(4)88×27+27×12
=(88+12)×27
=100×27
=2700;
(5)65×99+65
=65×(99+1)
=65×100
=6500;
(6)15×23-23×5
=(15-5)×23
=10×23
=230;
(7)125×32×5
=125×8×4×5
=(125×8)×(4×5)
=1000×20
=20000;
(8)35×202
=35×(200+2)
=35×200+35×2
=7000+70
=7070;
(9)98×15
=(100-2)×15
=100×15-2×15
=1500-30
=1470;
(10)3500÷4÷25
=3500÷(4×25)
=3500÷100
=35;
(11)25×28
=25×(4×7)
=25×4×7
=100×7
=700;
(12)545-167-145
=545-145-167
=400-167
=233.
642-(36+132)÷4的簡便計算
2樓:寶寶
642-(36+132)÷4的簡便計算
解:直接運算最簡便,
原式=642-168÷4
=642-42
=600
3樓:518姚峰峰
642-(36+132)÷4的簡便計算
=642-(36+100+32)/4
=642-(9+25+8)
=642-42
=600
4樓:匿名使用者
=642-36÷4-132÷4
=642-9-33
=642-42
=600
計算下面各題,能簡便計算的用簡便方法計算 2-6/13÷9/26 (1/3+1/4)×36 6/7×(4/5-2/3)÷1/5
5樓:數學新綠洲
2-6/13÷9/26
= 2- (6/13)×(26/9)
=2- 4/3
=2/3
.(1/3+1/4)×36
=(1/3)×36 +(1/4)×36
=12+9
=21.
6/7×(4/5-2/3)÷1/5
=(6/7)×(4/5 - 2/3)×5
=(6/7)×(4 - 10/3)
=(6/7)×(2/3)
=4/7
.3/4-3/4×4/7+9/7
=(3/4)×(1- 4/7)+
9/7=(3/4)×(3/7)+9/7
=(1/4)×(9/7)+ 9/7
=(1/4 +1)×(9/7)
=(5/4)×(9/7)
=45/28
=1又17/28
脫式計算,能簡便的要簡便計算.42÷(5.25÷0.25) 0.4+12.6÷0.28×0.2 8.4-8.4×1.5÷1.8 0.27×
6樓:嘎啦
①42÷自(5.25÷0.25)
=42÷(5.25×4)
=42÷21
=2②0.4+12.6÷0.28×0.2
=0.4+45×0.2
=0.4+9
=9.4
③8.4-8.4×1.5÷1.8
=8.4×(1-5 6
)=8.4×1 6
=1.4
④0.27×99+0.27
=0.27×(99+1)
=0.27×100
=27⑤2.5×3.2×0.125
=2.5×(0.4×8)×0.125
=(2.5×0.4)×(8×0.125)
=1×1
=1⑥13.5÷2.5÷0.
125÷0.4÷8=13.5÷(2.
5×0.125×0.4×8)=13.
5÷[(2.5×0.4)×(0.
125×8)]=13.5÷[1×1]
=13.5÷1
=13.5.
用遞等式計算,能用簡便方法的用簡便方法計算. 45-20×3÷4 26+14×(70-30) 125×(8×4)203×24 10
7樓:ˉever·專屬七
(1)45-20×
dao3÷4,內
=45-60÷4,
=45-15,
=30;
(2)26+14×(70-30),
=26+24×40,
=26+960,
=986;
(3)125×(8×4),
=125×8×4,
=1000×4,
=4000;
(4)203×24,
=(200+3)×容24,
=200×24+3×24,
=4800+72,
=4872;
(5)108-(83+360÷60),
=108-(83+6),
=108-89,
=19;
(6)153×8-8×53,
=(153-53)×8,
=100×8,
=800;
(7)180÷[36÷(12+6)],
=180÷[36÷18],
=180÷2,
=90;
(8)75×99+75,
=75×(99+1),
=75×100,
=7500.
下面各題能簡算的要用簡便計算.1.36+4.85+2.64+6.15 98.5÷2.5÷4 5.4÷[2.5×(3.7-2.9)]0.8×(4-3.6
8樓:□小千
(1)1.36+4.85+2.64+6.15,=(1.36+2.64)+(4.85+6.15),=4+11,
=15;
(2)98.5÷2.5÷4,
=98.5÷(2.5×4),
=98.5÷10,
=9.85;
(3)5.4÷[2.5×(3.7-2.9)],=5.4÷[2.5×0.8],
=5.4÷2,
=2.7;
(4)0.8×(4-3.68)÷0.01,=0.8×0.32÷0.01,
=0.256÷0.01,
=25.6;
(5)83.7-12.83-0.17,
=83.7-(12.83+0.17),
=83.7-13,
=70.7;
(6)5.96+13×(3.2-3.12),=5.96+13×0.08,
=5.96+1.04,=7.
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